How to stop watch dog

RE: How to stop watch dog

james — Wed, 17 Aug 2016 07:16:40 GMT

thanks.It works fine now.

RE: How to stop watch dog

Susheel Nuguru — Wed, 17 Aug 2016 06:42:36 GMT

sorry for the late answer, it should be ok to feed the watchdog in the interrupt handler.

RE: How to stop watch dog

james — Tue, 16 Aug 2016 07:17:13 GMT

I feed the dog in the interrupt of app timer. Is that ok?

RE: How to stop watch dog

james — Tue, 16 Aug 2016 07:15:00 GMT

It didn't reset until I make the external IO interrupt after DFU.And after I make several time of external IO interrupt , it become normal and don't reset.

RE: How to stop watch dog

Susheel Nuguru — Tue, 16 Aug 2016 06:54:07 GMT

if you feed the watchdog in the bootloader then after the dfu a reset will be generated and will also reset the watchdog registers, where you feed the watchdog depends on what you are trying to achieve?

RE: How to stop watch dog

james — Tue, 16 Aug 2016 06:50:53 GMT

how should I feed the watch dog in bootloarder. I had try to feed the dog like that,but it couldn't work fine after dfu.

/**@brief Function for initialization of time handle.
 */
//timer calender
static void timer_index_feed_wd( void *p_context )
{
   //fed the dog
	 NRF_WDT->RR[0] = WDT_RR_RR_Reload;
}


/**@brief Function for initializing the timer handler module (app_timer).
 */
static void timers_init(void)
{
    // Initialize timer module, making it use the scheduler.
    APP_TIMER_APPSH_INIT(APP_TIMER_PRESCALER, APP_TIMER_MAX_TIMERS, APP_TIMER_OP_QUEUE_SIZE, true);
	
	  uint32_t err_code;
	  err_code = app_timer_create( &FEED_WD_TIMER, APP_TIMER_MODE_REPEATED, timer_index_feed_wd );
    APP_ERROR_CHECK(err_code); 
}

main()
{
    .....
if (dfu_start || (!bootloader_app_is_valid(DFU_BANK_0_REGION_START)))
    {
				DisplayDFU( );
			  
				//stop timer
			  err_code = app_timer_start(FEED_WD_TIMER, FEED_WATCH_DOG_PERIOD, NULL);
				APP_ERROR_CHECK(err_code);
			
        // Initiate an update of the firmware.
        err_code = bootloader_dfu_start();
        APP_ERROR_CHECK(err_code);
    }

    if (bootloader_app_is_valid(DFU_BANK_0_REGION_START) && !bootloader_dfu_sd_in_progress())
    {
        // Select a bank region to use as application region.
        // @note: Only applications running from DFU_BANK_0_REGION_START is supported.	
				err_code = app_timer_stop( FEED_WD_TIMER );
				APP_ERROR_CHECK(err_code);
			
        bootloader_app_start(DFU_BANK_0_REGION_START);
    }
 ....
}

RE: How to stop watch dog

Susheel Nuguru — Tue, 16 Aug 2016 06:40:53 GMT

you cannot stop the watchdog once it is started. It can configured to pause while CPU is sleeping or debugger halted the CPU (in the CONFIG register) but in normal mode you cannot stop it.